Abstract
In the present study, undoped TiO2 and Nd–Ce-codoped TiO2 nanoparticles with different molar ratios of dopants were synthesized by the sol–gel method using starch as a natural additive. Structural and optical properties were investigated by Fourier transform spectroscopy, UV–Vis spectroscopy, scanning electron microscopy, energy dispersive analytical X-ray, transmission electron microscopy, and X-ray diffraction methods. Moreover, the direct band gap was calculated by Tauc’s approach. Furthermore, photocatalytic activity of all samples has been investigated under UV irradiation in an aqueous medium. Compared with undoped TiO2, the band gap of the Nd–Ce–TiO2 samples decreases and depends on the content of dopants. In addition, photocatalytic activity improves in the presence of appropriate amount (1 mol%) of dopants.
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